Answer:
68%
Step-by-step explanation:
<em><u>68-95-99.7% Rule:</u></em>
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This is the empirical rule which is used to remember the percentage of values that is within a band of the mean. We say:
- 68% of the data fall within 1 standard deviation of the mean
- 95% of the data fall within 2 standard deviation of the mean, and
- 99.7% of data falls within 3 standard deviations of the mean
Clearly, from the empirical rule, we see that about 68% of the area is between z = -1 and z = 1 (or within 1 standard deviation of the mean)
Answer:
4/5 if i did my math right
Step-by-step explanation:
You can write the proportion as 2 equal fractions or as two equal ratios.
or 12 pens:$10 = x pens:$15You can buy x pens for 15 dollars. One way to find x is by cross multiplying the fractions.
10x=12×15
10x=180
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10 10
x=18
You can buy 18 pens for $15.